The process of star and planet formation begins with a large cloud of gas and dust called a solar nebula. rank the formation events that occur within a cloud from earliest to latest.

rank from earliest to latest. to rank items as equivalent, overlap them.

a. the cloud is large, cool, and slowly rotating
b. the cloud collapses into a disk
c. competing rotational and gravitational forces begin to flatten the cloud
d. the cloud becomes denser, heats up, and rotates faster
e. the cloud starts to contract under the influence of gravity

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

the answer to this is proletariats.

hope this : )